// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:async';

import 'system_channels.dart';

/// Controls specific aspects of the system navigation stack.
class SystemNavigator {
  // This class is not meant to be instatiated or extended; this constructor
  // prevents instantiation and extension.
  // ignore: unused_element
  SystemNavigator._();

  /// Removes the topmost Flutter instance, presenting what was before
  /// it.
  ///
  /// On Android, removes this activity from the stack and returns to
  /// the previous activity.
  ///
  /// On iOS, calls `popViewControllerAnimated:` if the root view
  /// controller is a `UINavigationController`, or
  /// `dismissViewControllerAnimated:completion:` if the top view
  /// controller is a `FlutterViewController`.
  ///
  /// The optional `animated` parameter is ignored on all platforms
  /// except iOS where it is an argument to the aforementioned
  /// methods.
  ///
  /// This method should be preferred over calling `dart:io`'s [exit]
  /// method, as the latter may cause the underlying platform to act
  /// as if the application had crashed.
  static Future<void> pop({bool animated}) async {
    await SystemChannels.platform.invokeMethod<void>('SystemNavigator.pop', animated);
  }
}